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It was launched on an Atlas V 541. The cost of the launch service plus the cost of the operations to fly the rover to Mars and run it for one Martian year on the surface was about $700M. Written Jun 12, 2015.
Mars cost: How to cut it. Those are some big numbers -- but we can cut them. For one thing, Boeing and Lockheed Martin are hard at work building cheaper launch vehicles to cut launch costs to as little as $15 million per ton by as early as 2020, long before any Mars mission could depart.